Abstract
This paper proposed a hybrid precast concrete shear wall emulating monolithic construction (HPWEM) that utilized grouted vertical connecting reinforcements and unbonded posttensioned high-strength strands across the horizontal joint for the lateral resistance. The grouted reinforcements with predetermined debond length were used to provide strength by tension and energy dissipation by yielding. The posttensioned strands were mainly employed to offer the restoring force to reduce the residual displacement by elastic extension. The overlapping welded closed stirrups improved the confinement property of the restrained concrete, avoiding the brittle failure. Six HPWEM specimens, considering variables including the amounts of strands and the debond lengths of grouted reinforcements, as well as one referenced cast-in-place monolithic wall specimen, were tested under the low-cycle reversed lateral load. The HPWEM specimens were capable of providing strength, stiffness, ductility, and energy dissipation equivalent to that of the monolithic wall specimen under certain variable condition.
Highlights
Precast concrete walls have been continuously investigated by many researchers and the earliest research can trace to the PREcast Seismic Structural Systems (PRESSS) Research Program in the early 1990s [1]
Hybrid precast concrete wall system, utilizing a combination of mild steel and unbonded posttensioned steel passing through horizontal joint as lateral resistance system in seismic zones, has been studied previously [4, 5]
The hybrid precast wall system falls outside the specified monolithic concrete structural system according to American Concrete Institute (ACI) 31811 [9] and there always have been significant limitations existing on the engineering application of hybrid precast walls in seismic regions
Summary
Precast concrete walls have been continuously investigated by many researchers and the earliest research can trace to the PREcast Seismic Structural Systems (PRESSS) Research Program in the early 1990s [1]. Hybrid precast concrete wall system, utilizing a combination of mild steel and unbonded posttensioned steel passing through horizontal joint as lateral resistance system in seismic zones, has been studied previously [4, 5] The desirable properties such as self-centering character and energy dissipation performance were verified in the completed experimental and analytical work [6, 7]. A predetermined length of these reinforcements is debonded above the joints (by wrapping the reinforcements with plastic films) to limit the steel strains and prevent low-cycle fatigue fracture These grouted connection reinforcements anchored on both sides of the horizontal joint are designed to yield in tension and compression and provide flexural capacity as well as energy dissipation under lateral load into the nonlinear range. With respect to HPWEM, the specific project objectives in this paper are mainly to develop (1) experimental evidence demonstrating the emulative monolithic performance of the specimens under cyclic lateral force; (2) validated analytical models by ABAQUS; (3) the impact of different amounts of strands and different debond lengths of grouted reinforcements on lateral performance of the specimens
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